Exercise algebra.equations.quadratic.no-abc
Description
solve a quadratic equation without abc-formula
Derivation
-2*x^2-10*x == 2*(10-x^2)
⇒ algebra.equations.quadratic.same-con-factor-x^2-5*x == 10-x^2
⇒ algebra.equations.quadratic.cancel-5*x == 10
⇒ algebra.equations.coverup.timesx == -2